window.onload=RollPhoto;
function RollPhoto(){
	var speed=1;
	var tab=document.getElementById("demo");
	var tab1=document.getElementById("demo1");
	var tab2=document.getElementById("demo2");
	tab2.innerHTML=tab1.innerHTML;
	function Marquee(){
		if(tab2.offsetWidth-tab.scrollLeft<=0)
		tab.scrollLeft-=tab1.offsetWidth
		else{
			tab.scrollLeft++;
		}
	}
	var MyMar=setInterval(Marquee,speed);
	tab.onmouseover=function() {clearInterval(MyMar)};
	tab.onmouseout=function() {MyMar=setInterval(Marquee,speed)};
}
